发表机构
Technion—Israel Institute of Technology; Eastern Institute of Technology, Ningbo; Guangdong Technion—Israel Institute of Technology（以色列理工学院; 宁波东方理工大学; 广东以色列理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出将驱动强度作为双色谐波光谱的新维度，在石墨中实现多维阿秒计时，揭示强度相关延迟对能带色散的敏感性，为量子材料研究提供新观测量。
AI 中文摘要
双色高次谐波光谱被广泛用于获取亚周期电子动力学和谐波时间信息，包括气体、固体和液体中的谐波相位和阿秒啁啾。然而，此类时间观测量对额外激光控制参数的依赖关系在很大程度上仍未探索。在此，我们将驱动强度引入为高取向热解石墨（HOPG）中双色谐波光谱的一个额外维度。检索到的使第4和第5次谐波产率最大化的阿秒双色延迟随驱动强度系统地且不同地演变。半导体布洛赫方程计算重现了这些趋势，并揭示了强度相关延迟对电子能带色散的显著敏感性。我们的结果展示了狄拉克锥附近的多维阿秒计时，并确立了强度相关的双色延迟作为量子材料中能带色散的灵敏观测量。
英文摘要
Two-color high-harmonic spectroscopy is widely used to access sub-cycle electron dynamics and to retrieve harmonic timing information, including harmonic phases and attochirp across gases, solids, and liquids. However, the dependence of such timing observables on additional laser-control parameters remains largely unexplored. Here, we introduce driving intensity as an additional dimension of two-color harmonic spectroscopy in highly oriented pyrolytic graphite (HOPG). The retrieved attosecond two-color delays maximizing the 4th and 5th harmonic yields evolve systematically and differently with driving intensity. Semiconductor Bloch-equation calculations reproduce these trends and reveal a pronounced sensitivity of the intensity-dependent delays to the electronic band dispersion. Our results demonstrate multidimensional attosecond clocking near Dirac cones and establish intensity-dependent two-color delays as a sensitive observable for band-dispersion in quantum materials.
Comments6 pages, 5 figure, Supplemental Material available on request
